package com.aaa.whj.service;

import com.aaa.whj.dao.StockDao;
import com.aaa.whj.entity.Stock;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

/**
 * @Author: whj
 * @Version 1.0
 * @Date: 2022/12/8  16:52
 */
@Service
public class StockService_redisson {
    @Autowired
    private StockDao stockDao;

    @Autowired
    private RedissonClient redisson;


    //减库存
    public String decrement(Integer productid) {
        //获取锁对象
        RLock lock = redisson.getLock("product::" + productid);
        //必须为30秒
        lock.lock(30, TimeUnit.SECONDS);
        try {
            //1. 查找指定商品的库存
            Stock stock = stockDao.selectById(productid);
            //2. 判断库存数是否大于0
            if (stock.getStock() > 0) {
                //3.减库存
                stock.setStock(stock.getStock() - 1);
                stockDao.updateById(stock);
                System.out.println("商品编号为:" + productid + "的商品库存剩余:" + stock.getStock() + "个");
                return "商品编号为:" + productid + "的商品库存剩余:" + stock.getStock() + "个";
            } else {
                System.out.println("商品编号为:" + productid + "的商品库存不足。");
                return "商品编号为:" + productid + "的商品库存不足。";
            }
        } finally {
            //释放锁
              lock.unlock();
        }
    }
}






















